JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II DATA COMMUNICATION Previous Question Paper (August/September - 2022 - R13)

Data communication networks facilitate the exchange of information between devices, serving as the backbone for modern digital infrastructure. Key applications include:

• Resource Sharing: Allowing users to access shared hardware like printers, scanners, or storage devices across a network.
• Communication Services: Enabling email, instant messaging, video conferencing, and VoIP for real-time collaboration.
• Distributed Processing: Dividing complex tasks among multiple computers to increase computational efficiency.
• E-Commerce and Banking: Supporting secure financial transactions, online shopping, and remote banking services.

The primary advantages of these networks are:

• Efficiency and Speed: Data is transmitted rapidly over long distances, reducing the time required for information retrieval.
• Cost Effectiveness: Centralizing resources reduces the need for redundant hardware and software licenses.
• Reliability: Networks provide redundancy; if one path fails, data can often be rerouted to ensure availability.
• Scalability: Networks can be expanded by adding new nodes or segments without significant disruption to existing infrastructure.

Data communication networks are primarily classified based on their geographical span and the scope of their connectivity:

• Local Area Network (LAN): Designed for small geographical areas such as a single room, building, or campus. They offer high data transfer rates and are typically owned and managed by a single organization.
• Metropolitan Area Network (MAN): Covers a larger area than a LAN, typically spanning a city or a large campus. They often act as a high-speed backbone to connect multiple LANs.
• Wide Area Network (WAN): Spans large geographical distances, such as a country, continent, or the entire globe. WANs use leased telecommunication lines, fiber optics, or satellites to connect smaller networks.
• Personal Area Network (PAN): A very small network used for communication among personal devices like smartphones, tablets, and laptops, usually within a range of a few meters (e.g., Bluetooth).
• Wireless Networks (WLAN/WWAN): Networks that use radio waves or infrared signals instead of physical cables to provide connectivity, offering mobility to users.